[xmonad] Help with ManageHook

[Mike Sampson]

Many thanks! Works perfectly. I saw asks and liftX mentioned in other
ManageHooks but will need to read up on monads among other things to
understand them.

Mike

On Wed, Mar 18, 2009 at 10:08 PM, Daniel Schoepe <asgaroth_ at gmx.de> wrote:

> Mike Sampson wrote:
> > Hi,
> > I'm trying to write my own ManageHook however as I am still trying to
> > learn Haskell and don't have a 100% clear view of the internals of
> > XMonad I'm having some trouble.
> >
> > My goal is to set the transparency of certain windows, matched via class
> > name, as they are created. FadeInactive.hs has a setOpacity function
> > which does this no problem. FadeInactive is driven from a LogHook
> > whereas I want to drive it from a ManageHook. What is the *magic glue*
> > needed to do something like:
> >
> > [ className =? "URxvt" --> setOpacity window 0x99999999]
> >
> > in my manage hooks. I know that setOpacity is not a ManageHook and that
> > i need to wrap it in something however looking at other ManageHooks,
> > such as doFloat, has not made things clear to me. Can anyone help with
> > this or provide a better way of doing it?
> >
> > Regards,
> >
> > Mike
>
> If you want to get the window in question, you need to use `ask':
>
> .. --> (ask >>= \w -> liftX (setOpacity w 0x99999999) >> idHook)
>
> One also needs liftX to lift a normal X action into a Query(The type
> expected by the `-->' operator). idHook ensures the proper return
> type(ManageHooks have to return transformations of the window set, but
> since we don't want to change the window set itself, we use idHook).
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